Table 2.

Subject selection criteria and task variables across studies

Study	Subject selection		Task variables
	Selection basis	Criterion	Stimulus duration	Expression intensity	Stimuli randomized	Multiple choice	Response Time Limit
Blair, Cipolotti, 2000	PCL-R	≤20 / ≥30	3 s	morphs	√	√	√
Blair, Coles 2000	PSD	≤4 / ≥13	3 s	hexagon	√	√	√
Blair et al. 2001	PSD	<20 / >28	3 s	morphs	√	√	√
Blair et al. 2004	PCL-R	<20 / ≥30	3 s	morphs	√	√	√
Carr et al. 2005	SDRQ, Empathy	All	no limit	full intensity		√
Dadds et al. 2006	APSD	All	2 s	morphs	√	√
Dolan et al. 2006	PCL-SV	<17 / ≥17	no limit	morphs	√	√
Kosson et al. 2002	PCL-R	≤20 / ≥30	1 s	full intensity		√	√
Kropp et al. 1987	Abusiveness	History/no history of child abuse	30 s	full intensity	√	√
Lough et al. 2005	FTD Diagnosis, IRI	Diagnosis/ Healthy	23 s	morphs		√
Matheson et al. 2005	CCB	0 / ≥4 incidents	no limit	full intensity	√
McCown et al. 1986	Incarceration	Incarcerated/ Community	5 s	full intensity		√
Mitchell et al. 2006	PCL-R	≤20 / ≥30	3 s	morphs	√	√	√
Montagne et al. 2005	BIS/BAS	<10th / >90th percentile	not specified	morphs	√	√	√
Stevens et al. 2001	PSD	<20 / >25	2 s	full intensity		√
Walker et al. 1994	Externalizing	Diagnosis/ Healthy	20 s	full intensity	√	√	√
Walker 1981	Diagnosis	Aggressive-unsocialized/Healthy	no limit	full intensity		√	√
Walz et al. 1996	RBPC CD subscale	≤2 / ≥13	10 s	full intensity
Woodbury-Smith et al. 2005	Criminal record	0 / ≥1 conviction	5 s	hexagon	√	√
Zabel, 1979	School setting	Emotionally disturbed/ Normal	no limit	full intensity		√

Abbreviations: PCL-R = Psychopathy Checklist-Revised. PSD = Psychopathy Screening Device an alternate abbreviation for this scale is APSD. PCL-SV = Psychopathy Checklist: Screening Version. FTD = Frontotemporal dementia. IRI = Interpersonal Reactivity Index. CCB = Checklist of Challenging Behaviors. BIS/BAS = Behavioral Approach System/Behavioral Inhibition System. RBPC = Revised Behavior Problem Checklist. CD = Conduct Disorder. SRDQ = Self-Reported Delinquency Questionnaire.